So far, I have seen no evidence of any release of radiation, although there are a number of worrying factors in the form of a “perfect storm” which could – in a worst-case scenario – lead to an accident.

The latest updates include:

An “event” at the Fort Calhoun plant was reported to the Nuclear Regulatory Commission:

“Operations identified a potential flooding issue in the Intake Structure 1007 ft. 6 in. level. The area of concern is a the hole in the floor at the 1007 ft. 6 in. level where the relief valve from FP-1A discharge pipe goes through the raw pump bay and discharges into the intake cell. There is one penetration of concern. Flooding through this penetration could have impacted the ability of the station’s Raw Water (RW) pumps to perform their design accident mitigation functions.

“Efforts are in progress to seal the penetration.

“This eight-hour notification is being made pursuant to 10 CFR 50.72 (b)(3)(v).”

The flood begins higher up, at places like Dark Horse Lake in the Bitterroots, [Montana] where another 2 inches of snow fell late this week, landing on the 8 feet still on the ground.

“It’s all starting here,” said Jim Brusda with the National Weather Service in Great Falls, Mont. “It’s going to flow back down there toward Nebraska” …

“People who have been here 50 years, 70 years, say they haven’t seen anything like this … And there’s a lot of water to come” …

And as the snow-fed Missouri crosses Montana, it’s collecting record rainfall, too. Some areas received 10 inches in three weeks; 3 inches fell on a town in northeast Montana between Thursday and Friday.

The rain is expected to continue through the weekend. An even stronger storm system could surface next week.

The Kansas City Star notes the at the Army Corps of Engineers is planning on releasing more water:

Heavy rainfall expected over the Dakotas in coming days, combined with rains from the past few weeks, have officials worried they’re running out of space in upstream dams, potentially forcing them to release even more pent-up water downstream [the Missouri River] …

One of the Army Corps’ biggest tools is the Gavins Point Dam, the last stop for the Missouri River in South Dakota, which will blast out a record 150,000 cubic feet of water per second through at least mid-August.

Officials now think they might have to boost the amount to 160,000 cubic feet, saying they’re running out of options to manage all the water upstream.

“At this point, we have very little flexibility remaining,” Farhat said.

[I]n Pierre, South Dakota, the Army Corps announced it’ll raise releases at the Oahe Dam [a second dam] another 10,000 cubic feet per second this weekend. That will bring it to 160,000 by Sunday.

“We are transferring flood storage from Oahe and Big Bend to Fort Randall, which has more storage available at this time,” said Jody Farhat, chief of Water Management, U.S. Army Corps of Engineers, Northwestern Division. “The amount of rain has nearly filled the reservoirs, doing away with most of the flexibility we had built into our operations for this year,” said Farhat.

United States: Vermont

The State of Vermont has denied relicensing to the Vermont Yankee Nuclear power plant.

The Anshas Nuclear Reactor outside of Cairo has leaked small amounts of radioactive water. See this, this and this.

Japan: Monju

The New York Times has a must-read report on a situation at a reactor hundreds of miles from Fukushima which hasn’t turned into a catastrophe net, but could become a large-scale disaster:

Three hundred miles southwest of Fukushima, at a nuclear reactor perched on the slopes of this rustic peninsula, engineers are engaged in another precarious struggle.

The Monju prototype fast-breeder reactor — a long-troubled national project — has been in a precarious state of shutdown since a 3.3-ton device crashed into the reactor’s inner vessel, cutting off access to the plutonium and uranium fuel rods at its core.

Engineers have tried repeatedly since the accident last August to recover the device, which appears to have gotten stuck. They will make another attempt as early as next week.

But critics warn that the recovery process is fraught with dangers because the plant uses large quantities of liquid sodium, a highly flammable substance, to cool the nuclear fuel.

***

Prefecture and city officials found that the operator had tampered with video images of the fire to hide the scale of the disaster. A top manager at the plant recently committed suicide, on the day that Japan’s atomic energy agency announced that efforts to recover the device would cost almost $21.9 million. And, like several other reactors, Monju lies on an active fault.

Chubu Electric Power Co. said Friday that 43 pipes in a turbine steam condenser were found to be damaged at the Hamaoka nuclear plant in Shizuoka Prefecture, after the utility last month probed the leak of seawater into a reactor at the plant.

Two other pipes were found to be deformed, the utility added, without elaborating.

On May 14, some 5 tons of seawater entered the No. 5 reactor at the plant in the city of Omaezaki, following the discovery of around 400 tons of seawater in the condenser, which cools steam from the turbine and turns it into water.

The trouble occurred during work to put the reactor into a state of cold shutdown, according to Chubu Electric. At that time, about 530 tons of water were flowing per hour through the recirculation pipe for adjusting the water volume inside the reactor.

***

As the recirculation pipe had a fracture on its welded part near the lid, water that gushed out of it possibly damaged the pipes, the utility said.

The prefectural government found on Tuesday radioactive cesium exceeding the limit of 300 becquerels per kilogram in grass collected from pastures in four areas, including Tono and Otsuchi. The areas are located about 150 to 200 kilometers north of the Fukushima nuclear power plant.

It shows one wide belt of radiation reaching 225 kilometers south from the stricken reactors to Tokyo and another extending to the southwest. Within those belts are localized hot spots, including an oval that encloses northeast Tokyo and Kashiwa and neighboring cities in Chiba Prefecture.

***

A map of citizen measured radiation levels shows radioactivity is distributed in a complex pattern reflecting the mountainous terrain and the shifting winds across a broad area of Japan north of Tokyo which is in the center of the of bottom of the map.Radiation limits begin to be exceeded at just above 0.1 microsieverts/ hour blue. Red is about fifty times the civilian radiation limit at 5.0 microsieverts/hour. Because children are much more sensitive than adults, these results are a great concern for parents of young children in potentially affected areas.

“We have 20 nuclear cores exposed, the fuel pools have several cores each, that is 20 times the potential to be released than Chernobyl,” said Gundersen. “The data I’m seeing shows that we are finding hot spots further away than we had from Chernobyl, and the amount of radiation in many of them was the amount that caused areas to be declared no-man’s-land for Chernobyl. We are seeing square kilometres being found 60 to 70 kilometres away from the reactor. You can’t clean all this up. We still have radioactive wild boar in Germany, 30 years after Chernobyl.”

***

TEPCO announced that the accident probably released more radioactive material into the environment than Chernobyl, making it the worst nuclear accident on record.

Meanwhile, a nuclear waste advisor to the Japanese government reported that about 966 square kilometres near the power station – an area roughly 17 times the size of Manhattan – is now likely uninhabitable.

In the US, physician Janette Sherman MD and epidemiologist Joseph Mangano published an essay shedding light on a 35 per cent spike in infant mortality in northwest cities that occurred after the Fukushima meltdown, and may well be the result of fallout from the stricken nuclear plant.

The eight cities included in the report are San Jose, Berkeley, San Francisco, Sacramento, Santa Cruz, Portland, Seattle, and Boise, and the time frame of the report included the ten weeks immediately following the disaster.

“There is and should be concern about younger people being exposed, and the Japanese government will be giving out radiation monitors to children,” Dr MV Ramana, a physicist with the Programme on Science and Global Security at Princeton University who specialises in issues of nuclear safety, told Al Jazeera.

***

Gundersen points out that far more radiation has been released than has been reported.

***

According to Gundersen, the exposed reactors and fuel cores are continuing to release microns of caesium, strontium, and plutonium isotopes. These are referred to as “hot particles”.

“We are discovering hot particles everywhere in Japan, even in Tokyo,” he said. “Scientists are finding these everywhere. Over the last 90 days these hot particles have continued to fall and are being deposited in high concentrations. A lot of people are picking these up in car engine air filters.”

Radioactive air filters from cars in Fukushima prefecture and Tokyo are now common, and Gundersen says his sources are finding radioactive air filters in the greater Seattle area of the US as well.

The hot particles on them can eventually lead to cancer.

“These get stuck in your lungs or GI tract, and they are a constant irritant,” he explained, “One cigarette doesn’t get you, but over time they do. These [hot particles] can cause cancer, but you can’t measure them with a Geiger counter. Clearly people in Fukushima prefecture have breathed in a large amount of these particles. Clearly the upper West Coast of the US has people being affected. That area got hit pretty heavy in April.”

***

Gundersen pointed out that the units are still leaking radiation.

“They are still emitting radioactive gases and an enormous amount of radioactive liquid,” he said. “It will be at least a year before it stops boiling, and until it stops boiling, it’s going to be cranking out radioactive steam and liquids.”

Gundersen worries about more earthquake aftershocks, as well as how to cool two of the units.

“Unit four is the most dangerous, it could topple,” he said. “After the earthquake in Sumatra there was an 8.6 [aftershock] about 90 days later, so we are not out of the woods yet. And you’re at a point where, if that happens, there is no science for this, no one has ever imagined having hot nuclear fuel lying outside the fuel pool. They’ve not figured out how to cool units three and four.”

A water decontamination system has been halted after a rapid rise in radiation. Radiation limits were reached in 5 hours, when it wasn’t supposed to happen for a month

As Jamail notes, the long-term prognosis is challenging:

“Units one through three have nuclear waste on the floor, the melted core, that has plutonium in it, and that has to be removed from the environment for hundreds of thousands of years,” he said. “Somehow, robotically, they will have to go in there and manage to put it in a container and store it for infinity, and that technology doesn’t exist. Nobody knows how to pick up the molten core from the floor, there is no solution available now for picking that up from the floor.”

Dr Sawada says that the creation of nuclear fission generates radioactive materials for which there is simply no knowledge informing us how to dispose of the radioactive waste safely.

“Until we know how to safely dispose of the radioactive materials generated by nuclear plants, we should postpone these activities so as not to cause further harm to future generations,” he explained. “To do otherwise is simply an immoral act, and that is my belief, both as a scientist and as a survivor of the Hiroshima atomic bombing.”

Gundersen believes it will take experts at least ten years to design and implement the plan.

“So ten to 15 years from now maybe we can say the reactors have been dismantled, and in the meantime you wind up contaminating the water,” Gundersen said. “We are already seeing Strontium [at] 250 times the allowable limits in the water table at Fukushima. Contaminated water tables are incredibly difficult to clean. So I think we will have a contaminated aquifer in the area of the Fukushima site for a long, long time to come.”

Unfortunately, the history of nuclear disasters appears to back Gundersen’s assessment.

“With Three Mile Island and Chernobyl, and now with Fukushima, you can pinpoint the exact day and time they started,” he said, “But they never end.”

Note: There are also a number of decommissioned nuclear facilities around the world which are alleged to have been leaking for decades, such as the Sellafield processing plant in the UK and the Hanford nuclear site in the state of Washington.

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